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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korea Society For Power System Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Power System Engineering
Editor in Chief :
Volume & Issues
Volume 6, Issue 4 - Nov 2002
Volume 6, Issue 3 - Aug 2002
Volume 6, Issue 2 - May 2002
Volume 6, Issue 1 - Feb 2002
Selecting the target year
Reduction of Air Pollution Induced by Diesel Exhaust in Ships
Maeda, K. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 3, 2002, Pages 5~10
Power and Emission Characteristics of DI Diesel Engine with a Soybean Bio-diesel Fuel
Choi, B.C. ; Lee, C.H. ; Park, H.J. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 3, 2002, Pages 11~16
This paper describes the power performance and emission characteristics of the high speed direct injection diesel engine (2.9 litter displacements) driven by soybean oil asknown a bio diesel fuel. The results were compared to diesel fuel with blending bio diesel fuels. The soybean bio diesel fuel was added in the diesel fuel in concentration varying from 25% to 75% volume rates. We measured the emissions according to ECE 13 mode and full load, fixedengine speed. When the 25% bio diesel fuel was used, NOx emission at the ECE 13 mode test slightly decreased compared with diesel base engine. Over engine speed of 2000 rpm, the level of unburned hydrocarbon(HC) and carbon monoxide(CO) were the same to the diesel engine. Smoke emission decreased asthe blending bio diesel fuel rate increased.
Combustion Characteristics in Various Primary and Auxiliary Air Flux Conditions at a Coaxial Swirling Diffusion Combustor
Lee, Y.S. ; Oh, S.W. ; Bae, D.S. ; Lee, D.H. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 3, 2002, Pages 17~23
The purpose of this study is to investigate the combustion emission characteristics changing auxiliary air injection in combustion field of coaxial swirling diffusion combustor. For this purpose, mean temperature, CO, CO2, O2 and HC concentration were measured by changing excess air ratio and auxiliary air injection. As a result of this study, mean temperature, CO2 emission were increased and CO emission decreased by increasing auxiliary air. Therefore, this paper showed the auxiliary air injection effected strongly on flame structure and combustion emission characteristics.
Fracture Analysis of Plasma Spray Coating by Classification of AE Signals
Kim, G.S. ; Park, K.S. ; Hong, Y.U. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 3, 2002, Pages 24~30
The deformation and fracture behaviors of both Al2O3 and Ni 4.5wt.%Al plasma thermal spray coating were investigated by an acoustic emission method. Plasma thermal spray coating is formed by a process in which melted particles flying with high speed towards substrate, then crash and spread on the substrate surface cooled and solidified in a very short time, stacking of the particles makes coating. A tensile test is conducted on notch specimens in a stress range below the elastic limit of substrate. A bendind test is done on smooth specimens. The waveforms of AE generated from the both test coating specimens can be classified by FFT analysis into two types which low frequency(type I) and high frequency(type II). The type I waveform is considered to corresponds exfoliation of coating layers and type II waveform corresponds the plastic deformation of notch tip. The fracture of the coating layers can estimate by AE event and amplitude, because AE features increase when the deformation generates.
On the Deformation Analysis of the Brake Tube-End for Automobiles
Han, K.T. ; Park, J.S. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 3, 2002, Pages 31~35
Brake tube is considered one of the most important parts in automobile. The shape of brake tube end has a great influence on the function of brake, and the quality and productivity of brake tube have relation to die design. The forming process of brake tube end is performed by hydraulic press forming machine. In this paper, the forming processes of tube end for automobile is analyzed and designed to make the optimal form of brake tube end. Also, finite element analysis has been carried out using
3D to predict the optimal shape of brake tube end and the results obtained showed the optimal length between punch and chuck is
. The shape of tube end is in good agreement with the finite element simulations and the experimental results.
A Study on the Characteristics of Behavior of Tripod Mechanism in Swashplate Type Piston Motor
Ham, Y.B. ; Ha, J.H. ; Park, K.M. ; Kim, S.D. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 3, 2002, Pages 36~41
A swashplate type piston motor with a tripod joints is introduced to improve compactness and starting torque in conventional types of motor. If the driving torque of motor shaft is transmitted by utilizing the mechanism, its friction torque loss would be drastically reduced and mechanical efficiency would be improved because the lateral force on the piston of the rod type motor with tripod joints mechanism is relatively smaller than that of the conventional plunger type motor. In particular, kinematics analysis for the mechanism are done as a preliminary study to investigate the feasibility of the mechanism in the axial piston motor. General formulas are derived from the displacement and velocity analysis of the mechanism, showing relationships between output shaft and shoe holder motion. A series of numerical calculations are carried out for a medium size motor with 160cc/rev using the formulas and their graphical plots are shown as well.
Factors Influencing on movement of crashed Vehicle by using EDSMAC
Jung, H.K. ; Kang, D.M. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 3, 2002, Pages 42~48
Velocity change of crashed vehicle has been applied to assess the safety of passenger and degree of impact severity widely. In this study, 1 D crash analysis and 2 D crash analysis were performed for velocity change of crashed vehicle with HVE 2D, and factors used for these analysis are weight, C.G, roll resistance, stiffness and brake force which influence on velocity change of crashed vehicle. According to results, the velocity change of crashed vehicle was influenced by weight, center of gravity stiffness and brake force but not roll resistance.
Trajectory Tracking Control of A Pneumatic Cylinder Using An Input-Output Linearization Method
Jang, J.S. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 3, 2002, Pages 49~56
This study suggests a trajectory tracking controller composed of an input output linearization compensator and a linear controller. The input output linearization compensator is derived from the nonlinear equations of a pneumatic control system and it algebraically transforms a nonlinear system dynamics into a linear one, so that input output characteristics of the control system is linearized regardless of the variation of the operating point and linear control techniques can be applied. The results of nonlinear simulations show that the proposed controller tracks the given trajectories more accurately than a state feedback controller does.
The Study on the Analysis of the Acoustic Transfer Function for Reducing the Structure-borne Noise
Kim, K.M. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 3, 2002, Pages 57~63
This paper describes the acoustic analysis of mid duty truck. The focus of the analysis is on structure borne engine noise with major contributions of 2nd order. It has been previously recognized that the noise contribution of each transfer path of structure borne noise can be varied with the charateristics of each mounts and vibro acoustic sensitivity of car body. The structure of car body will be split up into three major sub components, which are modeled separately, the engine, the frame and the cab. The acoustic performance is evaluated on three levels: engine to frame transfer, frame to cab transfer, and panel contribution from cab to driver. In order to perform these analyses, analytical models are created for the engine, frame, cab and acoustic cavity. The models are linked through a coupled fluid structure calculation, and through FRF Based Substructuring for the structural couplings. Based on the structural coupling calculations, a transfer path analysis is performed to identify the most important transfer paths. These paths are then the focussing points for applying modifications to the structure or the mount system. Finally, a number of modification are proposed and their effect is quantified.
A Fast-Decoupled Algorithm for Time-Domain Simulation of Input-Series-Output-Parallel Connected 2-Switch Forward Converter
Kim, Marn-Go ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 3, 2002, Pages 64~70
A fast decoupled algorithm for time domain simulation of power electronics circuits is presented. The circuits can be arbitrarily configured and can incorporate feedback amplifier circuits. This simulation algorithm is performed for the input series output parallel connected 2 switch forward converter. Steady state and large signal transient responses due to a step load change are simulated. The simulation results are verified through experiments.
A Modeling of Proportional Pressure Control Valve and its Control
Yang, K.U. ; Lee, I.Y. ;
Journal of the Korea Society For Power System Engineering, volume 6, issue 3, 2002, Pages 71~77
In this study, a dynamic model of proportional pressure control valve using the bond graph and a predictive controller are presented in the form of dynamic matrix control which is concerned with a design method of digital controller for the electro hydraulic servo system. The bond graph can be utilized for all types of systems which involve power and energy, and it is applied to a propotional pressure control valve in this study. Recently, many researchers suggested that better control performance could be obtained by means of the predictive controls with future reference input, future control output and future control error. The Predictive controller is very practical because the controller can be easily applicable to a personal computer or a microprocessor. This study investigates through numerical simulations that hydraulic system with the predictive controller shows very good control performances.